Вплив коливань подачі шестеренного насоса на динамічні процеси в гідроприводі з довгою напірною гідролінією

Abstract

It is known that gear hydraulic pumps are characterized by significant supply pulsations, which can reach 30 % of its average value. Supply pulsations under certain conditions are caused by pressure fluctuations in pressure hydraulic lines and hydraulic units, which is a negative phenomenon, as it reduces the resource of their work. In this article, using the method of simulation modeling in the MATLAB Simulink environment, a study of a hydraulic drive of translational motion with a gear pump and a long pressure hydraulic line was carried out to identify the influence of drive parameters on the nature of dynamic processes caused by a sudden change in supply and oscillatory changes (pulsations) of pump supply relative to the possible occurrence of resonance phenomena in the pressure hydraulic line and in the drive as a whole. The effect of the length and diameter of the pipeline of the pressure hydraulic line, as well as the reduced modulus of elasticity of the pressure hydraulic line on the frequency and amplitude of resonant oscillations was studied. Research was carried out in a sufficiently wide range of frequencies of rotation of the drive shaft of the gear pump. This corresponds to the real operating conditions of mobile machines in which the pump of the hydraulic system is connected to the power take-off shaft of the internal combustion engine. As a result of research, it was established that noticeable resonance phenomena occur at relatively low frequencies of rotation of the pump shaft. It was also established that an increase in the length of the pressure hydraulic line, a decrease in the diameter of the pipeline and the reduced modulus of elasticity reduce the frequency of resonant oscillations. With an increase in the length of the pressure hydraulic line and an increase in the reduced modulus of elasticity, the amplitude of resonant oscillations increases, and with a decrease in the diameter of the pipeline, it decreases.